<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .loading-box {
            width: 1000px;
            height: 500px;
            background: url("./images/点1.png") no-repeat;
            background-size: 29px 10px;
            animation: loading 1s linear 0s infinite alternate;
        }

        @keyframes loading {
            0%{
                background: url("./images/点1.png") no-repeat;
                background-size: 29px 10px;
            }
            50%{
                background: url("./images/点2.png") no-repeat;
                background-size: 29px 10px;
            }
            100%{
                background: url("./images/点3.png") no-repeat;
                background-size: 29px 10px;
            }
        }
    </style>
</head>
<body>
<div class="loading-box"></div>
</body>
</html>
